[Live-devel] Adding support for DV video

[Ross Finlayson]

>In fact I use a whole DV frame (120000-576000 bytes), which will then be
>split across a large number of packets.  I take it this is not the
>correct way to use frames in liveMedia?

No, actually that is correct.  Those are very large frame sizes, though - yow!


>I am currently using the kluge of setting the maximum packet
>size to 1372 = 12 + 17 * 80, but it would be preferable to have a
>virtual function in MultiFramedRTPSink that could be used to override
>the default fragmentation behaviour.

Yes.  Your '1372 hack' will work for now, but a better solution 
(which I'll likely add myself) will be to have a 'fragmentation 
granularity' virtual function (default value: 1), which will give us 
more control over fragmentation.  Then the "MultiFramedRTPSink" code 
will work even if the programmer decides to call "setPacketSizes()" 
himself to specify very large MTUs (e.g., for a LAN) after he's 
created the "MultiFramedRTPSink" (subclass), but before he starts 
using it.


>How should the receiving application cope with packet loss?

Our RTP receiving code ("MultiFramedRTPSource") automatically 
detects, and discards, frames that contain lost packets, so the 
receiving application will get either complete frames, or no frame 
data at all.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/